Milling-machine cutter



June 26, 1923. 1,460,029

J. MATTSON MILLING MACHINE CUTTER Filed Oct. 30. 1922 ATTORNEYS Patented June 26, 1923.

Junmsmrrsou, or CHICAGO, rumors.

MILLING-MACHINE CUTTER.

Application fled October 80, 1922. Serial No. 597,898.

To all whom it may concern."

Be it known that I, JULIUS MA'I'ISON, a

citizen of the United States, and aresident Improvement in a Milling-Machine Cutter, 7

of which the following is a full, clear, and exact description.

My invention relates to improvements in milling machine cutters, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide milling machine cutters which are adapted to cut a piece of work faster than is possible with the ordinary cutters without sacrificing the uniform smooth out which is accomplished by the ordinary cutters.

A further object of my invention is to provide a device of the type described in which the cutters may be readily secured in place and be rigidly clamped in position.

further object of my invention is to provide a device of the type described. which makes use of circular and non-circular cutters, the circular cutters being adapted to do the rough cutting, while the non-circular cutters are adapted to smooth the work which has been cut by the circular cutters.

A further object of my invention is to provide a device of the type described in which the cutters may be turned, whereby the same cutters may be used for a relatively long length of time.

A further object of my invention is to provide a device of the type described which 18 simple in construction, durable and eflicient for the purpose intended, and which is not likely to easily get out of order.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings, forming part of this application, in which- Figure 1 is a plan view of the device, Figure 2 is a vertical section through the device,

Figure 3 is an end view of a portion of the device,

Figure 4 is a sectional view of another portion of the device,

Fi re 5 is a view of a modified form of the (fi vice, and

Figures 6 and 7 are diagrammatic views illustrating the various positions in which the cutters may be placed.

In carrying out m invention, I make use of a tool plate 1 w ich has av plurality of inwardly extending slots 2. The slots 2 project inwardly from the periphery of the plate 1, and are adapted to receive cutters. The tool plate 1 is secured to a spindle 3 in the ordinary manner, the openings 4 in the plate 1 permitting a wrench to be connected to the plate so that the plate may be readily attached to the spindle.

The slots 2 do not extend radially in the present form of the device, although the device may be constructed in this way. I then provide circular and non-circular cutters 5 and 6 which are in. reality discs. The cutters 5 and 6 in the present form of the device are disposed in the slots 2 and alternate with respect to each other.- The cutters 5 extend outwardly from the axis a greater distance than do the cutters 6. In Figure 1, I have shown this difference to an exaggerated degree so as to more clearly bring out the drawing. From Figure 2 it will be noted that the cutters 6 extend down wardly a greater distance than do the cutters 5. From this construction it will be apparent that the cutters 5 will ouge out the work and that the cutters 6 W111 smooth the work that has been out. In Figure '2 I have shown one of the cutters 5 as cutting the work 7 while the cutter 6 also cuts the work 7, but to a less depth than does the cutter 5, the cutter 6 being adapted to smooth the surface" 8.

Itis obvious that the plate ,1 may have all cutters 5 thereon, or all cutters 6, but I have found that the best results are obtained where the cutters 5 and 6 alternate with each other. With this assembly, a very rapid out may be made and at the same .time a smooth out. The cutters are secured to the plate 1 by a novel means shown in Figures 3 and 4. It will be noted from Figure 1 that the plate 1 has slots 9 adjacent to the slots or recesses 2. The slots 9 extend transversely through the plate 1 and parallel with the plane of the recesses 2. As clearly shown in Figure 3, the plate 1 has inwardly extending whereby the-screws 11 are held in place. It.

- is dispose will be obvious that when the screws 11 are disposed within the bores 10, they will force the piece of metal 14 firmly against the cutter, and thereby hold the cutter in place. A slot 15 extends inwardly from the recess 2, and is dis (1 parallel with the slot 9 that rtion of metal 14 is relatively thin and is adapted-to be flexed so as to firmly grip the cutter and hold the latter in place. In th s manner, the cutter may be he d in any position desired with respect to the plate 1.

cutters 5 have their outer and lower portions of the cutting edges in en agement with the work. The cutters 6 are isposed nearer the center of the axis of rotation of the plate 1 than are the cutters 5, but extend slightly beyond the plane which is tangent tothe under sides of the cutters 5. The sides of the cutters 6 which are disposed furthest from the axis of rotation will not engage with the work. The under sides of the cutters 6 will i cut the surface which has already been cut by the cutters 5. The cutters 6 have a straight cutting edge which smooths and fin ishes the out which has been made by the cutters 5. It will be noted from Figure 2 that the cutters 6 have small and large straight cutting surfaces 16 and 17, respectively. y merely rotating the cutters 6 with respect to the plate 1, either of these cutting edges may be brought into engagement with the work 7. It will also be obvious that the cutters 6 may last a relatively long time, since when one of the cutting edges is worn, the cutter may be rotated so as to bring another cutedge into engagement with the work.

tin In Iike manner, the cutter 5 may be rotated with respect to the platel so as to bring a portion of the cutter that is still sharp into engagement with the work. The cutters 5 and 6 are provided with central openings 18, whereb the cutters may be held or secured to a spindle when the cutters are sharpened. It is easier to sharpen thecutters 5 than it is to sharpen the cutters 6. The cutters 5 do the greater amount of the work and therefore they will wear out more quickly than will the cutters 6. As heretofore stated, the

cutters 6 are merely finishing cutters and provide a smooth surface 8 to the work. It will be seen from the for oing statement that the cutters 5 have to e ground more often than the cutters 6, but that the cutters 5 are more readily ground than are the cutadjacent to the screw 11. The.

'ters 6, since the cutters 5 are circular in shape. In the present form of the device,

the recesses 2 extend an larly with respect to the periphery of the p ate 1. This assembly 1permits the cutters to.do more effective wor than if the cutters extended radially with respect to the plate .1. It is obvious that the an le which the cutters assume with respect to t 9 plate 1 may be varied. In the diagrammatic showing in Figure 7 I have shown the cutters as being disposed in various angles with res ect to the radii of the plate 1. It should e noted, however, that the recesses 2 in one plate will all extend at the same angle. F igure7 is merely for the purpose of illustrating the various angles in which the cutters may be disposed. The cutters may also extend angularly with respect to a vertical plane passin through the rotating axis of the plate 1. have shown this in a diagrammatic view in Figure 6.

In some types of work, it is required to secure the cutters more firmly in place. In Figure 5 I have shown a means for accomplishing this purpose. It will be noted from this figure that there are two screws 20 provided in place of one screw 11. These screws lie in the same plane as the slot 21 and are adapted to force the portion of metal 22 into frictional engagement. with the cutter when the screws are tightened. In this manner the cutters are securely held in place. The device is very simple in construction, and as heretofore stated, is adapted to make a rapid and clean cut. This 1s accomplished by the use'of the two cutters 5 and. '6, the cutter 5 doing the rough work and the cutter 6 doing the finishing work. The cutters are readily assembled to the plate 1 and are rigidly locked in place by means of the screws 20 when once assembled.

A distinct advantage is obtained by providing substantially circular cutters, since the cutters may be rotated with respect to the work so as to bring the sharp edge of the cutter into engagement with the work. In this manner the life of the cutter is extended between the sharpening operations. The device is very eflicient for the purpose intended and is not likely to easily get out of order.

I claim:

1. A milling machine cutter comprising a circular plate adapted to be rotated, said plate having recesses in its outer periphery, cutters disposed in. said recesses, and means for locking said cutters in place, certain of said cutters extendin further from the axis of rotation of said p ate than the other cutters, while the work engaging portions of the other cutters extend below the work engagin portions of the first named cutters.

2. K milling machine cutter comprising a circular plate adapted to be rotated, said plate having recesses in its outer periphery, cutters disposed in said recesses, means for III III

7 locking said cutters in place, certain of said cutters extending further from the axis of rotation of said plate. than the other cutters, while the work engaging portions of the other cutters extend below the work engaging portions of the first named cutters, said means comprising portions of metal adapted to be forced into frictional engagement with said cutter, and screws for moving said portions into clamping engagement with said cutters.

3. A milling machine cutter comprising a circular plate adapted to be rotated, said plate having recesses extending inwardly from its periphery, a plurality of circular and non-circular cutters disposed in said recesses, the circular and non-circular cutters alternating with respect to each other.

4. A milling machine cutter comprising a circular plate adapted to be rotated, said plate having recesses extending inwardly from its periphery, a plurality of circular and non-circular cutters disposed in said recesses, the circular and non-circular cutters alternating with respect to each other, said circular cutters extending further from the axis of rotation of said plate than the noncircular cutters.

5. A milling machine cutter comprising a circular plate adapted to be rotated, said plate having recesses extending inwardly from its periphery, a plurality of circular and non-circular cutters disposed in said recesses, the circular and non-circular cutters alternating with respect to each other, said circular cutters extending further from the axis of rotation of said plate than the noncircular cutters, While the Work engaging portions of the non-circular cutters extend below the Work engaging portions of the circular cutters.

JULIUS MATTSON. 

